package files

import (
	"fmt"
	"os"
	"testing"
	"time"

	"codeberg.org/danjones000/my-log/config"
	"codeberg.org/danjones000/my-log/models"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestAppend(tt *testing.T) {
	tt.Run("success", func(t *testing.T) {
		t.Run("single", appendTestSingle)
		t.Run("two", appendTestTwoEntries)
		t.Run("new_line", appendTestAddNewLine)
		t.Run("no-new-line", appendTestDontAddNewLine)
		t.Run("dot-folder", appendTestDotFolder)
		t.Run("no-dot-folder", appendTestDotFolderNo)
		t.Run("no-ext", appendTestNoExt)
	})
	tt.Run("failure", func(t *testing.T) {
		t.Run("badEntry", appendTestBadEntry)
		t.Run("load-err", appendTestConfLoadErr)
		t.Run("mkdir-err", appendTestMkdirErr)
		t.Run("append-log-err", appendTestOpenErr)
	})
}

func setupAppendTest(t *testing.T) string {
	t.Helper()
	dir := t.ArtifactDir()
	config.Overrides["input.path"] = dir
	config.Overrides["input.ext"] = "log"
	t.Cleanup(func() {
		delete(config.Overrides, "input.path")
		delete(config.Overrides, "input.ext")
	})
	return dir
}

func appendTestSingle(t *testing.T) {
	dir := setupAppendTest(t)
	when := time.Now().Local()
	e := models.Entry{
		Title: "Jimmy",
		Date:  when,
		Fields: []models.Meta{
			{"foo", 42},
			{"bar", true},
		},
	}
	l := models.Log{
		Name:    "test",
		Entries: []models.Entry{e},
	}
	err := Append(l)
	require.NoError(t, err)
	require.FileExists(t, dir+"/test.log")
	by, err := os.ReadFile(dir + "/test.log")
	st := string(by)
	require.NoError(t, err)
	assert.Contains(t, st, "Jimmy\n")
	assert.Contains(t, st, "\n@foo 42")
	assert.Contains(t, st, "\n@bar true")
}

func appendTestTwoEntries(t *testing.T) {
	dir := setupAppendTest(t)
	when := time.Now().Local()
	whens := when.Format(models.DateFormat)
	e := []models.Entry{
		{Title: "one", Date: when},
		{Title: "two", Date: when},
	}
	l := models.Log{
		Name:    "test",
		Entries: e,
	}
	err := Append(l)
	assert.NoError(t, err)
	require.FileExists(t, dir+"/test.log")
	by, _ := os.ReadFile(dir + "/test.log")
	st := string(by)
	assert.Contains(t, st, fmt.Sprintf("@begin %s - one", whens))
	assert.Contains(t, st, fmt.Sprintf("@begin %s - two", whens))
}

func appendTestAddNewLine(t *testing.T) {
	dir := setupAppendTest(t)
	os.WriteFile(dir+"/test.log", []byte("foo"), 0644)
	when := time.Now().Local()
	whens := when.Format(models.DateFormat)
	e := []models.Entry{
		{Title: "one", Date: when, Fields: models.Metas{{"id", "jimmy"}}},
	}
	l := models.Log{
		Name:    "test",
		Entries: e,
	}
	err := Append(l)
	assert.NoError(t, err)
	require.FileExists(t, dir+"/test.log")
	by, _ := os.ReadFile(dir + "/test.log")
	exp := fmt.Sprintf("foo\n@begin %s - one\n@id jimmy @end\n", whens)
	assert.Equal(t, exp, string(by))
}

func appendTestDontAddNewLine(t *testing.T) {
	dir := setupAppendTest(t)
	os.WriteFile(dir+"/test.log", []byte("foo\n"), 0644)
	when := time.Now().Local()
	whens := when.Format(models.DateFormat)
	e := []models.Entry{
		{Title: "one", Date: when, Fields: models.Metas{{"id", "jimmy"}}},
	}
	l := models.Log{
		Name:    "test",
		Entries: e,
	}
	err := Append(l)
	assert.NoError(t, err)
	require.FileExists(t, dir+"/test.log")
	by, _ := os.ReadFile(dir + "/test.log")
	exp := fmt.Sprintf("foo\n@begin %s - one\n@id jimmy @end\n", whens)
	assert.Equal(t, exp, string(by))
}

func appendTestBadEntry(t *testing.T) {
	dir := setupAppendTest(t)
	e := models.Entry{
		Title: "Jimmy",
	}
	l := models.Log{
		Name:    "test",
		Entries: []models.Entry{e},
	}
	err := Append(l)
	assert.NoError(t, err)
	require.FileExists(t, dir+"/test.log")
	by, _ := os.ReadFile(dir + "/test.log")
	assert.Equal(t, []byte{}, by)
}

func appendTestDotFolder(t *testing.T) {
	config.Overrides["input.dotFolder"] = "true"
	t.Cleanup(func() {
		delete(config.Overrides, "input.dotFolder")
	})

	dir := setupAppendTest(t)
	e := models.Entry{
		Title: "something",
		Date:  time.Now(),
	}
	l := models.Log{
		Name:    "sub.test",
		Entries: []models.Entry{e},
	}
	err := Append(l)
	require.NoError(t, err)
	require.FileExists(t, dir+"/sub/test.log")
	by, err := os.ReadFile(dir + "/sub/test.log")
	st := string(by)
	require.NoError(t, err)
	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
}

func appendTestDotFolderNo(t *testing.T) {
	config.Overrides["input.dotFolder"] = "false"
	t.Cleanup(func() {
		delete(config.Overrides, "input.dotFolder")
	})

	dir := setupAppendTest(t)
	e := models.Entry{
		Title: "another",
		Date:  time.Now(),
	}
	l := models.Log{
		Name:    "sub.test",
		Entries: []models.Entry{e},
	}
	err := Append(l)
	require.NoError(t, err)
	require.FileExists(t, dir+"/sub.test.log")
	by, err := os.ReadFile(dir + "/sub.test.log")
	st := string(by)
	require.NoError(t, err)
	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
}

func appendTestNoExt(t *testing.T) {
	dir := setupAppendTest(t)
	config.Overrides["input.ext"] = ""
	t.Cleanup(func() {
		config.Overrides["input.ext"] = "log"
	})

	e := models.Entry{
		Title: "baz",
		Date:  time.Now(),
	}
	l := models.Log{
		Name:    "foobar",
		Entries: []models.Entry{e},
	}
	err := Append(l)
	require.NoError(t, err)
	require.FileExists(t, dir+"/foobar")
	by, err := os.ReadFile(dir + "/foobar")
	st := string(by)
	require.NoError(t, err)
	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
}

func appendTestConfLoadErr(t *testing.T) {
	dir := t.ArtifactDir()

	currConf := config.ConfigPath
	tmp, _ := os.CreateTemp(dir, "app-conf-*.toml")
	fname := tmp.Name()
	t.Cleanup(func() { tmp.Close() })
	t.Cleanup(func() { os.Remove(fname) })
	fmt.Fprintln(tmp, `{"not":"toml"}`)
	config.ConfigPath = fname
	t.Cleanup(func() { config.ConfigPath = currConf })

	err := Append(models.Log{})
	assert.ErrorContains(t, err, "toml")
}

func appendTestMkdirErr(t *testing.T) {
	// Don't run this test as root
	config.Overrides["input.path"] = "/var/my-logs-test"
	t.Cleanup(func() { delete(config.Overrides, "input.path") })

	err := Append(models.Log{})
	assert.ErrorContains(t, err, "permission denied")
}

func appendTestOpenErr(t *testing.T) {
	dir := setupAppendTest(t)
	l := models.Log{
		Name: "test-open-err",
	}
	fname := dir + "/test-open-err.log"
	os.MkdirAll(dir, 0750)
	f, _ := os.Create(fname)
	f.Close()
	os.Chmod(fname, 0400)
	err := Append(l)
	assert.ErrorContains(t, err, "permission denied")
}